ML21286A367

Amendment 29 to Updated Final Safety Analysis Report, Chapter 7, Table 7.5, Neutron Monitoring System, SRM Trips

ML21286A367
Person / Time
Site:	Browns Ferry
Issue date:	10/04/2021
From:	Tennessee Valley Authority
To:	Office of Nuclear Reactor Regulation
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Download: ML21286A367 (5)

Text

BFN-22 Table 7.5-1 SRM TRIPS Trip Function Trip Action SRM upscale or inoperative Annunciator, amber light SRM upscale or inoperative Display, amber light, rod block SRM downscale (detector Bypass detector limit switch retraction permissive)

SRM downscale Annunciator, white light, rod block SRM downscale Display, white light SRM period Annunciator, amber light SRM period Display, amber light SRM retraction permissive Display, white light SRM bypassed Display, white light Table 7.5-2 IRM TRIPS Trip Function Trip Action IRM Hi-Hi or inoperative Scram IRM Hi-Hi or inoperative Annunciator, red light IRM Hi-Hi or inoperative Display, red light IRM upscale Rod block IRM upscale Annunciator, amber light IRM upscale Display, amber light IRM downscale Rod block (exception on most sensitive scale)

IRM downscale Annunciator, white light IRM downscale Display, white light IRM bypassed Display, white light

BFN-29 Table 7.5-3 LPRM TRIPS TRIP FUNCTION TRIP RANGE TRIP SETPOINT TRIP ACTION LPRM downscale 2% to full scale 3% Light and annunciator annunciator LPRM upscale 2% to full scale 100% Light and annunciator LPRM bypass Manual Switch N/A Light and annunciator and APRM, averaging compensation Table 7.5-4a APRM TRIPS UNIT 1 EPU/MELLLA+ CONDITIONS TRIP FUNCTION TRIP POINT RANGE TRIP SETTING/ SETPOINT ACTION ANALYTICAL LIMIT (AL)

APRM downscale 0% to full scale N/A Rod Block APRM thermal power Varied with flow 0.61 Flow + 66.15 adjustable Rod Block upscale (high) for DLO (AL) 0.55 (Flow-Flow Offset)

+ 63.5 adjustable for SLO (AL)

APRM thermal power 7% to 27% 13% Rod Block upscale (in startup)

APRM inoperative N/A Not in operate, critical Rod Block self-test fault, or too few LPRM detectors APRM thermal Varied with flow 0.61 Flow + 70.15 Scram power upscale adjustable for DLO (AL) flow biased 0.55 (Flow-Flow)+67.5 adjustable (high-high) for SLO (AL)

APRM inoperative N/A Not in operate or Scram critical self-test fault APRM upscale 10% to 30% 23% Scram (in startup)

APRM upscale 10% to full scale 125.4% Scram Fixed trip (high-high)

BFN-29 BFN-28 Table 7.5-4b (Deleted)

BFN-22 Table 7.5-4c (Deleted by Amendment 19)